https://bugs.kde.org/show_bug.cgi?id=501690

--- Comment #5 from Alexandre Belz <alexandre.b...@live.fr> ---
Thank you Maik for your support.

> Make sure you don't mark multiple people, as this will result in incorrect 
> assignments. Only confirm/ignore the same person at once.
Well... for a few validation, I would understand. But here I have 3000
unconfirmed faces to review, and going 1 by one would be very tedious. 

Moreover, It happen several times that I confirmed a single face and rapidly
confirmed the next good ones... but in the meanwhile, digiKam took the decision
to re-arrange the faces, in such a way that my mouse click applied to an
unwanted face. That is really frustrating. 
It's even worth if a face detection process is running in the background :
faces get added/rearranged under my mouse even if I don't review anything,
making it difficult (random/risky) to review faces.

To be 100% safe, it seems digiKams needs me to 
1) stop any background face detection process I may have launched
2) go into Unconfirmed faces, review 1 single face.
3) wait a few seconds that digiKam faces process stabilizes. 
loop 2,3.
No need to say that 3000 faces will need years of review at this rythme.

I intensively used face assignment in Picasa years ago, and I don't remember
having such issue reviewing the "Unconfirmed" faces, even when background face
detection was running. Maybe Picasa did not rearranged dynamically the
unconfirmed faces, I'm not sure. Anyway, Picasa was build in a way that I was
able to quickly review/assign people unconfirmed faces, in a stable and safe
manner. Do you think that digiKam could get to this reliability point ?

Could we imagine something stronger / faster / safer ?
1) support multiple (unconfirmed) face selection and then Confirm / Reject /
Ignore/ Rename ? with no risk to get the selection modified/broken of course.
2) imagine a way for face thumbnails to stay in place until the manual review
is finished. For instance when a people assignment is done, lock the
arrangement, just remove the green rectangle. Update the display only if a
manual Refresh is called.
3) more difficult, find a way to allow a safe (unconfirmed) people review while
a face detection is running in the background. This means that detecting new
faces would NOT change the face thumbnail arrangement. Maybe removing the
people grouping and just adding the newly detected faces at the end, like a
pile. Is there a sorting mode that I could configure to get to this point in
the current version ?

Warmest regards.

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